Collapsible core for molding or casting.



- G. ATTERBURY.

GOLLAPSIBLE GORE FOR MOLDING 0R CASTING.

APPLICATION FILED NOV; 12, 1909.

Patented Oct. 29, 1912.

3 SHEETSSHEET l.

Inventor: I

raszrenar/{fierbury COLUMBIA PLANOGRAPH cc.. WASHINGTON, D. C

iii) G. ATTERBURY.

GOLLAPSIBLE GORE FOR MOLDING 0R CASTING.

APPLICATION FILE-D NOV. 12, 1909. Patented Oct. 29

CIJLUMBIA PLANDGRAPH C0" WASHINGTON, D4 C.

G. ATTERBURY.

GOLLAPSIBLE GORE FOR MOLDING 0E CASTING.

APPLIOATION FILED NOV. 12, 1909.

1,042,749. Patented 0ct.29, 1912.

3 SHEBTSSHEET 3.

Q Q Inventor 6705'2/67207" zzerburg GROSVENOR ATTERBURY, OF NEW YORK, N.Y.

COLLAPSIBLE CORE FOR MOLDING OR CASTING.

Specification of Letters Patent.

Patented Oct. 29, 1912.

Application filed November 12, 1909. Serial No. 527,717.

To all whom it may concern Be it known that I, GROSVENOR A'rrnn- BURY, acitizen of the United-States, and resident of the borough of Manhattan,city, county, and State of New York. have invented certain new anduseful Improvements in Collapsible Cores for Molding or Casting, ofwhich the following is a clear and complete disclosure.

My invention relates to that class of molding apparatus in which thebody or block is cast with a central hole, or holes, formed by means ofa suitable core, or cores, adapted to be withdrawn after the block isformed and has suiliciently hardened to maintain its shape.

The object of my invention is to produce a core light, simple and cheapin construction, which shall be reasonably durable and may be easilywithdrawn from the block, even when the block is of unusual length,without damaging the block or displacing the material.

Further features, advantages and benefits of my invention will beapparent from the following specification and the accompanying drawings,forming a part thereof, in which Figure 1 is a horizontal sectional viewof one form of my improved core; Fig. 2 is an enlarged vertical sectiontaken on the line aa of the core shown in Fig. 1; Fig. 3 is a detailview of the core shown in Fig. 1 and shows the filler piece withdrawnand the walls of the core drawn in or contracted. Fig. 4 is a horizontalsectional view of a modified core in which the filler pieces areomitted. Fig. 5 is a detail view of the hinge joints connecting the sideplates of the structure shown in Fig. 4. Fig. 6 is a sectional view online b?) of Fig. 4.

Referring in detail to the drawings illustrating the modification shownin Figs. 1, 2 and 3, 1 designates the side walls, or forming plates ofthe core. There are four of these and between their adjacent edges thereare placed filler blocks or pieces 2. These pieces serve to close thejoints bet-ween the sections or forming plates, constituting the wall ofthe core and may be withdrawn as hereinafter pointed out, in order toallow the forming plates to be drawn inwardly so as to collapse orcontract the core. An upright- 3 is centrally disposed or placed in thecore and connected to this upright 3 are arms 4 and 5, extending andconnected to the filler pieces placed at the sides of the core. Themembers 4 and 5 are pivoted at each end so as to permit the center pieceto move longitudinally. The arrangement is such that if the center piece3 be displaced longitudinally, either by raising or lowering it, thefirst result will be the withdrawing of the filler pieces 2. This isaccomplished by connecting the arms 4 and 5 to the filler piecesdirectly and to the side walls, or forming plates 1 by a lost motionarrangement, which takes the form of slots 6, in which are disposed thebolts 7. Vhen the member 3 is raised or lowered, the filler pieces 2 arefirst withdrawn because they are rigidly connected to the arms 4 and 5and the sides move later because of the slots 6. As soon as the bolts 7reach the ends of the slots 6 the hinges 8 come into action and draw theends of the forming plates together inwardly, as shown in Fig. 3, thuscontract-ing the core. Only a slight movement is necessary to withdrawthe filler pieces, and in some cases there will be sufficient lostmotion to permit their withdrawal without the slot 6. For expanding thecore the member 3 is brought to its normal position. This forces theends of the sides away from one another, and inserts the filler piecesas shown in Fig. 1.

In Figs. 4, 5 and 6, the forming plates or sides 1 are joined by hinges10 connected at their center joint- 11 to arms 12, which extend and aresecured to a common center piece 3. The arms 12 are pivoted at bothends, and the arrangement is such that the center piece may be movedlongitudinally to thrust out or draw in the arms 12. When the arms 12are thrust out the hinges 10, which extend the full length of the core,are extended straight and form a part of the side walls of the core asshown in Fig. 4. lVhen the arms 12 are drawn in, they close the hingesas shown in Fig. 5, drawing the forming plates toward the center piece3, and thus reducing the size of the core so that it can be readilywithdrawn from the block or casting. For the purpose of withdrawing mycore from the block, I may provide a ring 9 at the top of the centerpiece 3. If the core be lifted by means of this ring the first resultwill be to contract the core so that it can be easily withdrawn from theblock.

In the drawings I have illustrated a square core with the arms forpulling in the side or forming plates of equal length. Should the moldbe other than square or round, the arms can readily be equalized as tolength by extending the rigid projections attached to the center pieceand to which the arms are pivoted or the shorter arms may be extended bypivoting them on the farther side of the center piece.

IVhile I have illustrated a core rectangular in form and composed offour side members, or forming plates, it is obvious that the shape ofthe core may be varied at will, as may also the number of the sidemembers, or forming plates, which may be only two in number, orincreased to any desired number.

I am aware that other modifications 01": my core may be made by thoseskilled in the art without departing from the spirit or scope of myinvention, and I desire to secure protection for all such modificationsas come within the scope of my claims.

hat I claim is:

1. In a core, a plurality of retractable forming plates, a plurality offiller pieces disposed between them, operating members having a pivotedconnection with said filler pieces and a lost motion connection Withsaid plates and adapted when thrust out to expand the core and insertthe tiller pieces and when pulled in to Withdraw the filler pieces andcontract the core, substantially as described.

2. In a core a plurality of retractable forming plates, a plurality oftiller pieces disposed between them, operating members having a pivotedconnection with said filler pieces, and hinges connected at one end tothe forming plates and at the other end to the filler pieces,substantially as described.

Dated November 1, 1909.

GROSVENOR ATTERBURY.

Witnesses IVALTER S. JONES, J OHN IV. Pn'rnns.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

